Everyone might know I've posted an update to the OpenGL port at http://wp.me/p3br5A-2v/
My oppinion?
I don't mind OpenGL IF you give the option to set different texture filterings, lets say, Linear, Nearest, whatever.
I can't stand blurry borders on sprites. I love seeing pixels in my screen. And that is actualy one of the features I like from A&A or for any other 199x game.
But don't missunderstand me. I also like fancy effects such as dynamic lights, decals, projectile trails and such.
You can take a look at EDGE Engine. It works under OpenGL but you can choose the filtering style, as well as activate/deactivate graphical effects like dynamic lights and so.
About high res, I don't mind playing at 320x200 or 1366x768. Maybe I prefer a little bit 320x200 because looking a fuzz of pixels in the distance is some way to simulate the viewing limit of our eyes. Also, seeing that fuzz makes me to inmerse more in the game like "Oh noes, something is moving in the distance!!! What the hell is that? Should I get closer or leave it?"
It makes the game more RPG-ish to not know what is in the far distance.